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POIsolatedStorageSettings.ApplicationSettings not persisting all properties
 

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    <p>I'm trying to serialize and deserialize this class to Windows Phone ApplicationSettings, but for some reason, only the <code>Items</code> are persisted and not the <code>Title</code> or <code>LastChanged</code> properties. Any ideas as to why are appreciated!</p> <p>Class:</p> <pre><code>public class VehicleCollection : ObservableCollection&lt;Vehicle&gt; { public string Title { get; set; } public DateTime LastChanged { get; set; } public bool HasNoItems { get { return Items.Count == 0; } } public VehicleCollection() { } public VehicleCollection(string title, DateTime lastChanged) { Title = title; LastChanged = lastChanged; } protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e) { base.OnCollectionChanged(e); OnPropertyChanged(new PropertyChangedEventArgs("HasNoItems")); } } </code></pre> <p>Persist logic:</p> <pre><code> public static bool SavePersistent(string key, object value) { if (null == value) return false; var store = IsolatedStorageSettings.ApplicationSettings; if (store.Contains(key)) store[key] = value; else store.Add(key, value); store.Save(); return true; } public static T LoadPersistent&lt;T&gt;(string key) { var store = IsolatedStorageSettings.ApplicationSettings; if (!store.Contains(key)) return default(T); return (T)store[key]; } </code></pre> <p><hr /> Edit: I've created a sample project where the behavior is evident. <a href="http://www.fileswap.com/dl/2ar0ygF8w7/" rel="nofollow">http://www.fileswap.com/dl/2ar0ygF8w7/</a></p> <ol> <li>Run the app and watch the static data being created</li> <li>Press "save data" to save to IsolatedStorage</li> <li>Close and re-run the app</li> <li>Watch the title for both collections disappear, as they were not persisted</li> </ol>
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    1. COAs weird as this may sound, this behavior is by design. See this question: http://stackoverflow.com/questions/666054/c-sharp-inheriting-generic-collection-and-serialization It's about `XmlSerializer` but it also applies to `DataContractSerializer` (which is used internally by `IsolatedStorageSettings`)
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    2. COThanks KooKiz, that seems to be the culprit. Still weird, but I guess I'll have to work around it. Thanks again!
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